Determination of Fenitrothion, Phosphamidon and Dimethoate in Natural Water

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Abstract
Three organophosphorus pesticides: fenitrothion, phosphamidon, and dimethoate are important chemicals for the protection of Canadian forests from defoliators. This paper describes a method for the determination of residues of these chemicals in natural waters. Since fenitrothion and phosphamidon were not resolved on several GLC columns commonly used in our laboratory, the separation was accomplished through serial solvent extraction using different solvents prior to GLC analysis. This solvent partitioning step also serves to some extent as confirmation of pesticide identity. The effects of storage on these pesticides in distilled and natural waters are also reported. As little as 0.01 ppb of fenitrothion and dimethoate and 0.05 ppb of phosphaidon in 1 liter of water can be determined.